Pololu DRV8835 Dual Motor Driver for Raspberry Pi 2/3

# Here's an example Python code to control two DC motors using the Pololu DRV8835 Dual Motor Driver for Raspberry Pi 2/3. The code
# demonstrates how to control the motor speed using PWM and change the motor direction using GPIO pins.

# To use the code, connect the Pololu DRV8835 Dual Motor Driver's inputs to the corresponding pins on your Raspberry Pi as specified in # the code, and run the Python script. The motors will run in both directions at different speeds with a pause in between.

# Remember to connect the driver's power supply pins (VCC and GND) to a suitable power supply for your motors, the motor terminals to
# the driver's outputs (M1A and M1B for Motor 1, M2A and M2B for Motor 2), and the driver's GND pin to the GND pin on the Raspberry Pi.

# Before running the code, make sure to install the RPi.GPIO library on your Raspberry Pi if it's not already installed. You can
# install it using the following command:

# sudo apt-get install python3-rpi.gpio

# To run the Python script, save the code in a file named, for example, "dual_motor_driver_example.py" and execute the following
# command in the terminal:

# python3 dual_motor_driver_example.py

# The example code provided controls the direction and speed of two motors independently, running them clockwise and counter-clockwise # at different speeds with a pause in between. You can modify this code to suit the specific requirements of your project or
# application.

import RPi.GPIO as GPIO
import time

# Pololu DRV8835 Dual Motor Driver for Raspberry Pi 2/3 example

# Motor 1
motor1PWM = 12 # Connect Motor 1 PWM input to GPIO 12 (PWM0) on the Raspberry Pi
motor1DIR = 5  # Connect Motor 1 DIR input to GPIO 5 on the Raspberry Pi

# Motor 2
motor2PWM = 13 # Connect Motor 2 PWM input to GPIO 13 (PWM1) on the Raspberry Pi
motor2DIR = 6  # Connect Motor 2 DIR input to GPIO 6 on the Raspberry Pi

# Setup GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(motor1PWM, GPIO.OUT)
GPIO.setup(motor1DIR, GPIO.OUT)
GPIO.setup(motor2PWM, GPIO.OUT)
GPIO.setup(motor2DIR, GPIO.OUT)

# Initialize PWM
pwm1 = GPIO.PWM(motor1PWM, 100) # Set PWM frequency to 100 Hz
pwm2 = GPIO.PWM(motor2PWM, 100) # Set PWM frequency to 100 Hz
pwm1.start(0)
pwm2.start(0)

try:
    while True:
        # Rotate both motors clockwise at full speed
        GPIO.output(motor1DIR, GPIO.HIGH)
        pwm1.ChangeDutyCycle(100) # Set duty cycle (0-100 for speed control)

        GPIO.output(motor2DIR, GPIO.HIGH)
        pwm2.ChangeDutyCycle(100) # Set duty cycle (0-100 for speed control)

        print("Both motors running clockwise at full speed.")
        time.sleep(2) # Run the motors for 2 seconds

        # Stop both motors
        pwm1.ChangeDutyCycle(0)
        pwm2.ChangeDutyCycle(0)

        print("Both motors stopped.")
        time.sleep(2) # Wait for 2 seconds

        # Rotate both motors counter-clockwise at half speed
        GPIO.output(motor1DIR, GPIO.LOW)
        pwm1.ChangeDutyCycle(50) # Set duty cycle (0-100 for speed control)

        GPIO.output(motor2DIR, GPIO.LOW)
        pwm2.ChangeDutyCycle(50) # Set duty cycle (0-100 for speed control)

        print("Both motors running counter-clockwise at half speed.")
        time.sleep(2) # Run the motors for 2 seconds

        # Stop both motors
        pwm1.ChangeDutyCycle(0)
        pwm2.ChangeDutyCycle(0)

        print("Both motors stopped.")
        time.sleep(2) # Wait for 2 seconds

except KeyboardInterrupt:
    print("Exiting...")

finally:
    # Cleanup
    pwm1.stop()
    pwm2.stop()
    GPIO.cleanup()